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Treacodactyl

Loft insulation

I need to clean out the old insulation in a loft and insulate it from scratch.

Firstly, I don't suppose anyone is aware of any deals at the moment? You used to be able to pick up loft insulation for a 1 a roll but those deals are long gone. Not being on benefits and having some insulation seems to rule me out of anything I can find.

Secondly, is there anything special I should be looking for? The cheapest options seem to be the recycled glass or plain glass mineral wool.

Prices seem to be 20 for around 5.5 SQM @ 20 cm thick.
dpack

rock wool is much nicer to work with than anything glass based

be aware of wires and lights etc ,try not to make them overheat ,a gap above a fitting and lifting wires above the insulation helps.if the electrics are a bit old and manky get a spark to sort that first.

when disposing of the old stuff full ppe (including fiber proof clothes)

last one i did i used 20 cm between the joists and then 20cm across giving a deep blanket but it made it very noticeably warmer

the materials are quite cheap and pay for themselves in a year or two

make a point of dealing with any drips ,holes in the roof etc as part of the job .
dpack

ps if there is any plumbing dont insulate under it ,insulate it or over it

expanded polystyrene board is ideal for tanks and the foam tube stuff will do pipes.lots of folk have insulated lofts and frozen their pipes first cold snap Rolling Eyes
Treacodactyl

I've insulated a few lofts, so know what I'm doing. As for the material I also thought mineral wool was better than glass fibre but the stuff nowadays is called "glass mineral wool".

It'll take me longer to recoup money on it, it's looking like costing 800+ and next year I should be heating with just my own wood.
sean

I take it you've checked eligibility for British Gas's scheme.
Treacodactyl

Yes, thanks, part of the house is newer and insulated so I'll not qualify. I also don't want cavity wall insulation and I'm not sure you can get one without the other.
sean

I thought you probably had. It seemed more open than others though so I thought it might be useful for anyone else looking at the thread.
Treacodactyl

Yes, there's more details on the MSE site: http://www.moneysavingexpert.com/utilities/free-cavity-loft-insulation
Mistress Rose

There is a possibility that you may be able to get some grant through your county council. Ours were offering it a little while ago, and I don't think you had to be on benefits to get it.
Treacodactyl

Nothing on offer at our local council that I can get, well unless I'm willing to wait at least 9 months... Laughing
onemanband

I don't know of any deals, but would recommend CCF for bulk purchase.
Slim

air-seal first!
GrahamH

Do not air seal if using laid lagging. By putting insulation on to the top of the ceilings means your loft will become less warm so ensure you lag any pipework and tankage within the roof space. Some do not fit the lagging below such items to allow the rising heat to warm these items. If choosing this method, lagging is placed over the top.
Sealed will cause problems with wood rot, you need a controlled air flow, not a gale.
If you are applying insulation to the underneath of the roof covering one can then air seal the roof space; air should circulate from the rooms below.
Soffits are sometimes fitted with the vents to allow the required air flow to insulated roof spaces.
Slim

Do not air seal if using laid lagging. By putting insulation on to the top of the ceilings means your loft will become less warm so ensure you lag any pipework and tankage within the roof space. Some do not fit the lagging below such items to allow the rising heat to warm these items. If choosing this method, lagging is placed over the top.
Sealed will cause problems with wood rot, you need a controlled air flow, not a gale.
If you are applying insulation to the underneath of the roof covering one can then air seal the roof space; air should circulate from the rooms below.
Soffits are sometimes fitted with the vents to allow the required air flow to insulated roof spaces.


have no idea what the American equivalent of laid lagging is, but it sounds like you're talking about the difference between a hot roof and a cold roof. Seems like it's one of the most common screw-ups in DIY home improvement.

Don't rot your rafters! Very Happy
Treacodactyl

air-seal first!


I'm not sure what you mean but you wouldn't seal an old loft. As Graham says, leave ventilation around the edge of the loft and lay a layer of insulation between the ceiling joists, then a layer at 90 on top of that. Put insulation on pipes, leave an uncoverd area under a tank and take care to not cover cabling to avoid overheating issues. The rafters would be ventilated from the gaps in or around the soffits..
Treacodactyl

I don't know of any deals, but would recommend CCF for bulk purchase.

Thanks for that. They don't show online prices do they?

I've picked up some bottom lay 100mm insulation to start the project. I picked it up from Wickes with a 20 off 100 spend. Possibly more expensive but it means I don't have 50 rolls of stuff knocking around while I clean out the old rubbish.
onemanband

You'll have to phone/visit branch for prices.
Not the sort of place you go for a couple of rolls or boards, but usually cheaper than merchants on large purchases. Also got trucks with forklifts on if you ordering lots of boards.
Oh and there's Sheffield Insulation They got on-line prices.
Slim

air-seal first!

I'm not sure what you mean but you wouldn't seal an old loft. As Graham says, leave ventilation around the edge of the loft and lay a layer of insulation between the ceiling joists, then a layer at 90 on top of that. Put insulation on pipes, leave an uncoverd area under a tank and take care to not cover cabling to avoid overheating issues. The rafters would be ventilated from the gaps in or around the soffits..

I forget how differently our homes were built. By and large we don't have any plumbing in attic spaces.

I meant to air seal the living space from the attic space, the attic space should still be well ventilated, and is often times benefitted by increasing the ventilation. Spray foam, or at least caulking around ceiling panel joints, around the top plate of the house, around any intrusions through the ceiling panel. etc.... that's what I meant by air sealing before putting down the new insulation.

Here's a nice diagram showing the jist of what I'm saying
http://sunshinecontractingcorp.com/wp-content/uploads/2012/01/insulation-diagram_winter1.png
Nick

Re: Loft insulation

I need to clean out the old insulation in a loft and insulate it from scratch.

Firstly, I don't suppose anyone is aware of any deals at the moment? You used to be able to pick up loft insulation for a 1 a roll but those deals are long gone. Not being on benefits and having some insulation seems to rule me out of anything I can find.

Secondly, is there anything special I should be looking for? The cheapest options seem to be the recycled glass or plain glass mineral wool.

Prices seem to be 20 for around 5.5 SQM @ 20 cm thick.

http://www.moneysavingexpert.com/utilities/free-cavity-loft-insulation?utm_source=MSE_Newsletter&utm_medium=nt-hiya&utm_term=29-Sep-15-v4&utm_campaign=utilities&utm_content=17#britishgas

They're talking as if the deals are back on, maybe.
Treacodactyl

Thanks for the link Nick but I still fail on the following "You have existing loft insulation more than 50mm thick, covering more than a third of the loft. "

The good news is the Wickes insulation I mentioned to is now buy 2 rolls for 30 and they currently have a spend 100 get 20 off reusable offer, so I've got another car load at the reduced price and another 40 off. Thankfully I have a roomy gas guzzling 4x4 to get it all in. laughing6
dpack

Laughing

hope your vacuum cleaner has a long lead,i found out the hard way that the wrapping on insulation might be ok on your rolls but if one split beforehand it sticks to the outside of the packaging until it meets a car seat.
Treacodactyl

You haven't seen the car, I use dust covers to keep things clean when I put them in the car, not to keep the car clean. dpack

Laughing

however there is dirty and there is horribly itchy
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